swift-actor-persistence

Swift actors eliminate data races in persistence layers by enforcing compile-time serialized access to shared mutable state, removing the need for manual locks or DispatchQueues. This prevents concurrency crashes and hard-to-debug threading issues in offline-first iOS and macOS apps.

The best way to build thread-safe local storage for offline-first iOS apps is using a hybrid approach: Swift actors for serialized state access paired with in-memory O(1) caching and atomic JSON file persistence for durable, crash-resistant data.

Yes, you can use Swift actors to migrate legacy DispatchQueue-based concurrency code. Actors provide compile-time thread safety, replacing error-prone manual synchronization with a reusable generic pattern for any Codable and Identifiable model types.

Yes, Swift actor persistence works on macOS with any model types conforming to Codable and Identifiable. The generic pattern applies to local user settings, cached content management, and offline-first data storage.

Atomic JSON file persistence ensures crash-resistant data durability for shared mutable state by writing files atomically. Combined with in-memory caching, it provides fast O(1) access while preventing data corruption during concurrent write operations.